My problem - the sticker says nothing about mobi-support. If there would be Adobe-DRM-support AND Mobi-nonDRM-support, I think, mobi would be in the list.

I'd like to see something a little more "official" from iRex than a sticker. The sticker certainly gives the impression that things are going to be changing with regards to the supported formats (and it makes sense that they would), but I'd like to see an announcement from them before I jump to far to a conclusion.